Legacy Securestack B2G switches hang management

I thought I will ask the question here as the problem switches that I have is very old.
A client of ours have a few hundred B2G switches deployed.

Recently these switches started showing the same problematic symptoms:
The Management interface freezes.
This results in no SNMP, SSH or console access.
We have also seen that all the devices that is connected to the switch continues to operate.
When you connect a new device it does not get an IP, as if the MAC address table does not populate.

The switch is running the last released firmware.

The only config that was changed over the past 6 months was a change in SNMP from v2 to v3

We have noticed that all the switches displaying these symptoms is running for more than 700 Days.

Thank you very much for your configuration. From what i see and do not see are some other questions.
!. The CPU/processes are not really that high so that is good.
2. I do see some possible questions in the processes that are not clearly showing good or a bad situation. The following processes are stating that this is a possible link up/down issue. The nim_t process takes care of different interfaces on the switch
ca6e9a8 hapiLinkStatusTask 0.40% 0.29% 0.07%
d57b290 nim_t 0.80% 2.07% 0.87%

I would run the following commands to help debug a possible link state issue. (Please log the sessions)
set logging local console enable file enable
set logging default severity 8
set logging application CLIWEB level 8 (This logs commands/changes)
set logging application STP level 8 (This is a debuging command for Link/down of ports "Please Do not read into the STP messages as this is a debugging for port change state unless a message specifies a TCN-(topology change notification) Please focus of ports/Interfaces bouncing. Then note the possible bouncing ports and investigate.
Please let me know if there are any questions
Jason

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